Built for heat
Fresno roofs take a lot of heat. National Weather Service records show 69 days at or above 100°F in 2021, and even the coolest summer on record still had 15. Months of intense sun dry out asphalt shingles, crack sealants around vents, and degrade some low-slope membranes. When you choose a new roof, ask about materials and colors that reflect more sunlight. Cool-roof shingles and light-colored membranes can reduce attic temperatures, and California's energy code includes cool-roof provisions for some projects. Your contractor or building department can tell you what applies to your home.
Attics and air conditioning
A hot attic shortens roof life and makes the air conditioner work harder, especially when ducts run through it. Good ventilation, with intake vents at the eaves and exhaust near the ridge, keeps attic temperatures down. If your home has a powered attic fan, ask whether it's pulling conditioned air out of the house through ceiling gaps, which some do. Radiant barriers are another option some homeowners consider; ask the contractor to explain the expected benefit for your roof.
Rare freezes, real rain
NOAA's engineering weather data for Fresno records only about 10 freeze-thaw cycles a year, so ice damage is uncommon. Rain, when it comes, usually arrives in winter. Clear gutters and valleys in fall, and have flashing, pipe boots and roof-to-wall joints checked before the rainy season, because those are where heat-dried materials fail first. Tule fog in winter can keep shaded roof slopes damp for days, so watch north-facing slopes for moss and algae.
Flat and low-slope roofs
Some Fresno homes have flat or low-slope sections over additions, patios or the main house. These roofs need positive drainage; water that sits in low spots after a storm speeds up wear. Ask the contractor how they'll handle drainage and what membrane they recommend for the heat.
Evaporative coolers on roofs
Roof-mounted evaporative coolers add weight, water lines and penetrations. Leaks around their curbs and supply lines are a common source of ceiling stains. When you re-roof, ask how the contractor will flash the cooler curb and whether it's a good time to remove an unused unit.
Before you hire
Ask Fresno roofers about reflective materials, attic ventilation, how they'll handle any rooftop equipment, and whether the permit is included. Get the scope, schedule and warranty in writing.
Timing your project
In Fresno, extreme midsummer heat makes roofing work harder on crews and can make some shingles too soft to walk on safely in the afternoon. Many contractors start early in the day. Spring and fall are usually comfortable times for a re-roof, and scheduling before the winter rains means any problems are fixed before they turn into leaks.
Warranties
There are usually two warranties on a new roof: the manufacturer's warranty on materials and the contractor's warranty on workmanship. Ask how long each lasts, what they cover, and whether the manufacturer warranty requires registration or specific installation methods.